A.O. Smith ATMOSPHERIC VENTED WATER HEATER Installation And Operating Instructions Manual page 28

PROBLEM
COMBUSTION ODOURS
SMOKING AND CARBON FOR-
MATION (SOOTING)
BURNER FLAME FLOATS
BURNER FLAME LIFTS OFF
PORTS
BURNER FLAME TOO HIGH
FLAME BURNS AT ORIFICE
PILOT WILL NOT REMAIN LIT
SMELLY WATER
HIGH OPERATION COSTS
POSSIBLE CAUSE(S)
1. Insufficient secondary air
2. Flue clogged
3. Heater installed in a confined area
1. Insufficient secondary air
2. Low gas pressure
3. Flue clogged
4. Defective gas control/thermostat
5. Heater installed in a confined area
6. Burner flame yellow-lazy
7. Finish oils on steel parts
1. Orifice too large
2. Flue too large
3. Flue clogged
4. Cold drafts or cold start-ups
1. High gas pressure
2. Air contamination
1. Orifice too large
1. Defective gas control/thermostat
2. Low gas pressure
3. Orifice not properly installed
1. Air in gas line
2. Defective pilot electrode
3. Cold drafts
4. Gas control valve ECO switch open
5. Door mounted temperature cut-off (TCO)
activated
6. Flue damper end switch open
7. Flammable vapours switch activated
8. Low gas pressure
9. Defective electrode cable/connection
10. Improper or loose connections at the TCO
switch
1. Sulfur in the water
1. Thermostat set too high
2. Sediment or lime in tank
3. Water heater too small for job
4. Wrong piping connections
5. Leaking faucets
6. Gas leaks
7. Wasted hot water
8. Long runs of exposed piping
9. Hot water piping in exposed wall
10. Leaks or cracks in dip tube
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CORRECTION
1. Provide ventilation to water heater. Check
flue way, flue baffle, burner
2. Clean, locate source and correct
3. Provide fresh air ventilation
1. Provide ventilation to water heater. Check
flue way,flue baffle, burner
2. Check with gas utility company
3. Clean, locate source and correct
4. Replace gas control/thermostat (37C con-
trol)
Refer to "24 Volt Honeywell Control
Service" section (24V control)
5. Provide fresh air ventilation
6. See "Burner Flame Yellow-Lazy"
7. Smoking or smells will burn off within an
hour. Open the window on start-up
1. Replace with correct orifice
2. Refer to our installation codes and size vent
to the size of draft-hood
3. Check flue and burner and clean if required
4. Locate draft source and correct
1. Check the input rate with orifice size
2. Check the combustion air quality
1. Replace with correct orifice
1. Replace gas control/thermostat
2. Check with gas utility company
3. Reinstall the orifice
1. Bleed the air from the gas line
2. Replace pilot assembly
3. Locate source and correct
4. Replace gas control/thermostat (37C con-
trol)
Refer to "24 Volt Honeywell Control
Service" section (24V control)
5. Call a qualified service technician
6. Replace the flue damper (24V control)
7. Eliminate flammable vapour source. Call a
qualified service technician.
8. Check with the gas utility company.
9. Replace or fix the cable and or connection
10. Check the connections at the TCO switch
1. Replace the anode with a special anode
1. Set temperature dial to lower setting
2. Drain/Flush-Provide water treatment if
needed
3. Install adequate size heater
4. Correct piping-dip tube must be in cold inlet
5. Repair faucets/Install thermal expansion
tank
6. Check with utility-repair at once
7. Advise customer
8. Insulate piping
9. Insulate piping
10. Check dip tube. Replace if faulty